using AcDream.App.Studio;
using AcDream.App.UI;
using AcDream.App.UI.Layout;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// Unit tests for <see cref="CharacterStatController"/> — the Attributes-tab controller that
/// binds the REAL importer-mounted header + 9-row list + footer elements (no created overlay).
/// Pure data wiring against fake layouts; no dats, no GL.
///
/// <para>Pass 1 tests verify header/XP meter/attribute list/footer State-A binding.
/// Pass 2 tests verify: (a) row click → selection toggle; (b) footer State-B content;
/// (c) raise-button affordability; (d) tab button states.</para>
/// </summary>
public class CharacterStatControllerTests
{
    // ── Header labels bind to the sheet ──────────────────────────────────────

    [Fact]
    public void Bind_SetsNameLabel()
    {
        var name = new UiText();
        var layout = Fake((CharacterStatController.NameId, name));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Studio Player", name.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_SetsLevelLabel()
    {
        var level = new UiText();
        var layout = Fake((CharacterStatController.LevelId, level));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("126", level.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_SetsHeritageAndPkLabels()
    {
        var heritage = new UiText();
        var pk       = new UiText();
        var layout   = Fake((CharacterStatController.HeritageId, heritage),
                            (CharacterStatController.PkStatusId, pk));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Aluvian Heritage",  heritage.LinesProvider()[0].Text);
        Assert.Equal("Non-Player Killer", pk.LinesProvider()[0].Text);
    }

    // ── XP meter fill ────────────────────────────────────────────────────────

    [Fact]
    public void Bind_SetsXpMeterFill()
    {
        var meter = new UiMeter();
        var layout = Fake((CharacterStatController.XpMeterId, meter));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var fill = meter.Fill();
        Assert.NotNull(fill);
        Assert.True(System.MathF.Abs(fill!.Value - 0.63f) < 0.001f, $"expected ~0.63, got {fill}");
    }

    // ── Attribute list — 9 rows in list box 0x1000023D ───────────────────────

    [Fact]
    public void Bind_AttributeList_Has9Rows()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Rows are UiClickablePanel which inherits UiPanel, so OfType<UiPanel> matches.
        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
    }

    [Fact]
    public void Bind_AttributeList_RowsAreClickablePanels()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        Assert.Equal(9, rows.Count);
        // All rows must have an OnClick wired (not null) and ClickThrough = false.
        foreach (var row in rows)
        {
            Assert.NotNull(row.OnClick);
            Assert.False(row.ClickThrough, "clickable row must accept pointer hits");
        }
    }

    [Fact]
    public void Bind_AttributeList_EachRowHasRightAlignedValueLabel()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
        foreach (var row in rows)
        {
            var texts = row.Children.OfType<UiText>().ToList();
            Assert.True(texts.Count >= 2, "each row must have at least name + value UiText");
            var valueEl = texts[^1];
            Assert.True(valueEl.RightAligned, "value label must be RightAligned");
        }
    }

    [Fact]
    public void Bind_AttributeList_RowNamesInRetailOrder()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);

        string[] expectedNames =
        {
            "Strength", "Endurance", "Coordination", "Quickness", "Focus", "Self",
            "Health", "Stamina", "Mana",
        };

        for (int i = 0; i < 9; i++)
        {
            var texts = rows[i].Children.OfType<UiText>().ToList();
            Assert.True(texts.Count >= 2, $"row {i} must have name + value");
            string rowName = texts[1].LinesProvider()[0].Text;
            Assert.Equal(expectedNames[i], rowName);
        }
    }

    [Fact]
    public void Bind_AttributeList_RowValues_AttributeIntegersAndVitalsCurMax()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiPanel>().ToList();

        string ValueOf(UiPanel row) => row.Children.OfType<UiText>().ToList()[^1].LinesProvider()[0].Text;

        Assert.Equal("200", ValueOf(rows[0]));   // Strength
        Assert.Equal("10",  ValueOf(rows[1]));   // Endurance
        Assert.Equal("10",  ValueOf(rows[2]));   // Coordination
        Assert.Equal("200", ValueOf(rows[3]));   // Quickness
        Assert.Equal("10",  ValueOf(rows[4]));   // Focus
        Assert.Equal("10",  ValueOf(rows[5]));   // Self
        Assert.Equal("5/5",   ValueOf(rows[6]));   // Health
        Assert.Equal("10/10", ValueOf(rows[7]));   // Stamina
        Assert.Equal("10/10", ValueOf(rows[8]));   // Mana
    }

    [Fact]
    public void Bind_AttributeList_IconHasBackgroundSpriteWhenResolverProvided()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
            spriteResolve: id => (id, 16, 16));

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);

        var iconEl = rows[0].Children.OfType<UiText>().First();
        Assert.Equal(0x060002C8u, iconEl.BackgroundSprite);

        var healthIcon = rows[6].Children.OfType<UiText>().First();
        Assert.Equal(0x06004C3Bu, healthIcon.BackgroundSprite);
    }

    [Fact]
    public void Bind_AttributeList_IconBackgroundSprite_ZeroWhenNoResolver()
    {
        var list   = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter, spriteResolve: null);

        var rows = list.Children.OfType<UiPanel>().ToList();
        Assert.Equal(9, rows.Count);
        foreach (var row in rows)
        {
            var iconEl = row.Children.OfType<UiText>().First();
            Assert.Equal(0u, iconEl.BackgroundSprite);
        }
    }

    // ── Footer State A ────────────────────────────────────────────────────────

    [Fact]
    public void Bind_FooterStateA_TitleIsSelectPrompt()
    {
        var title = new UiText();
        var layout = Fake((CharacterStatController.FooterTitleId, title));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Initial state (nothing selected): State-A title.
        Assert.Equal("Select an Attribute to Improve", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1LabelIsSkillCreditsAvailable()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Skill Credits Available:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line1ValueIsSkillCredits()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine1Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("96", val.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2LabelIsUnassignedExperience()
    {
        var lbl = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Label, lbl));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Unassigned Experience:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void Bind_FooterStateA_Line2ValueIsUnassignedXp()
    {
        var val = new UiText();
        var layout = Fake((CharacterStatController.FooterLine2Value, val));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var expected = (87_757_321_741L).ToString("N0");
        Assert.Equal(expected, val.LinesProvider()[0].Text);
    }

    // ── Pass 2: Row selection → Footer State B ───────────────────────────────

    [Fact]
    public void RowClick_SelectRow4Focus_FooterStateBShowsFocusTitle()
    {
        // Focus is index 4 in AttrRows. SampleData Focus = 10. Cost = 110.
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // Simulate a click on row 4 (Focus).
        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        Assert.Equal(9, rows.Count);
        rows[4].OnClick!();

        // Footer title should now be "Focus: 10".
        Assert.Equal("Focus: 10", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine1LabelIsExperienceToRaise()
    {
        var lbl  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine1Label, lbl),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        Assert.Equal("Experience To Raise:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine1ValueIsRaiseCost()
    {
        var val  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine1Value, val),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        // Focus raise cost = 110 (SampleData fixture).
        Assert.Equal((110L).ToString("N0"), val.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine2LabelIsUnassignedExperience()
    {
        var lbl  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine2Label, lbl),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        Assert.Equal("Unassigned Experience:", lbl.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SelectRow4Focus_FooterLine2ValueIsUnassignedXp()
    {
        var val  = new UiText();
        var list = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterLine2Value, val),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);
        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();

        // UnassignedXp = 87_757_321_741L
        var expected = (87_757_321_741L).ToString("N0");
        Assert.Equal(expected, val.LinesProvider()[0].Text);
    }

    // ── Pass 2: Toggle deselects ──────────────────────────────────────────────

    [Fact]
    public void RowClick_ToggleSameRow_ReturnsToFooterStateA()
    {
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // Select Focus (row 4).
        rows[4].OnClick!();
        Assert.Equal("Focus: 10", title.LinesProvider()[0].Text);

        // Click the same row again → deselect.
        rows[4].OnClick!();
        Assert.Equal("Select an Attribute to Improve", title.LinesProvider()[0].Text);
    }

    [Fact]
    public void RowClick_SwitchRow_UpdatesToNewRow()
    {
        var title = new UiText();
        var list  = new UiPanel();
        var layout = Fake(
            (CharacterStatController.FooterTitleId, title),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // Select Endurance (row 1, value=10).
        rows[1].OnClick!();
        Assert.Equal("Endurance: 10", title.LinesProvider()[0].Text);

        // Select Self (row 5, value=10).
        rows[5].OnClick!();
        Assert.Equal("Self: 10", title.LinesProvider()[0].Text);
    }

    // ── Pass 2: Row highlight ─────────────────────────────────────────────────

    [Fact]
    public void RowClick_SelectRow_HighlightsSelectedAndClearsOthers()
    {
        var list  = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();

        // All rows start transparent.
        Assert.All(rows, r => Assert.Equal(0f, r.BackgroundColor.W));

        // Select row 2 (Coordination).
        rows[2].OnClick!();
        Assert.NotEqual(0f, rows[2].BackgroundColor.W);    // highlighted
        Assert.Equal(0f,    rows[0].BackgroundColor.W);    // others cleared
        Assert.Equal(0f,    rows[1].BackgroundColor.W);
    }

    [Fact]
    public void RowClick_Deselect_ClearsHighlight()
    {
        var list  = new UiPanel();
        var layout = Fake((CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[2].OnClick!();   // select
        rows[2].OnClick!();   // deselect

        Assert.Equal(0f, rows[2].BackgroundColor.W);
    }

    // ── Pass 2: Raise button affordability ───────────────────────────────────

    [Fact]
    public void RaiseButtons_InitiallyHidden()
    {
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.False(btn1.Visible,  "raise×1 must start hidden");
        Assert.False(btn10.Visible, "raise×10 must start hidden");
    }

    [Fact]
    public void RaiseButtons_AffordableRow_ShowsNormalState()
    {
        // Focus row (index 4) cost=110, UnassignedXp=87_757_321_741 → affordable.
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        list.Children.OfType<UiClickablePanel>().ToList()[4].OnClick!();  // select Focus

        Assert.True(btn1.Visible,  "raise×1 visible on selection");
        Assert.True(btn10.Visible, "raise×10 visible on selection");
        Assert.Equal("Normal", btn1.ActiveState);
        Assert.Equal("Normal", btn10.ActiveState);
    }

    [Fact]
    public void RaiseButtons_MaxedRow_ShowsGhostedState()
    {
        // Strength row (index 0) cost=0 → disabled. UnassignedXp is irrelevant.
        var btn1   = MakeButton();
        var btn10  = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.RaiseTenId, btn10),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        list.Children.OfType<UiClickablePanel>().ToList()[0].OnClick!();  // select Strength (cost=0)

        Assert.True(btn1.Visible,   "raise button visible even when disabled");
        Assert.Equal("Ghosted", btn1.ActiveState);
        Assert.Equal("Ghosted", btn10.ActiveState);
    }

    [Fact]
    public void RaiseButtons_Deselect_HidesButtons()
    {
        var btn1   = MakeButton();
        var list   = new UiPanel();
        var layout = Fake(
            (CharacterStatController.RaiseOneId, btn1),
            (CharacterStatController.ListBoxId, list));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        var rows = list.Children.OfType<UiClickablePanel>().ToList();
        rows[4].OnClick!();  // select
        Assert.True(btn1.Visible);
        rows[4].OnClick!();  // deselect
        Assert.False(btn1.Visible, "raise button hidden after deselect");
    }

    // ── Pass 2: Tab button states ─────────────────────────────────────────────

    [Fact]
    public void TabButtons_AttributesGroupButtons_SetToOpenState()
    {
        var tabGroup = new UiPanel();     // fake tab group container
        var btn1     = MakeButton();
        var btn2     = MakeButton();
        tabGroup.AddChild(btn1);
        tabGroup.AddChild(btn2);

        var layout = Fake((CharacterStatController.TabAttribId, tabGroup));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        // All UiButton children of the Attributes group should be "Open".
        Assert.Equal("Open", btn1.ActiveState);
        Assert.Equal("Open", btn2.ActiveState);
    }

    [Fact]
    public void TabButtons_SkillsGroupButtons_SetToClosedState()
    {
        var tabGroup = new UiPanel();
        var btn      = MakeButton();
        tabGroup.AddChild(btn);

        var layout = Fake((CharacterStatController.TabSkillsId, tabGroup));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Closed", btn.ActiveState);
    }

    [Fact]
    public void TabButtons_TitlesGroupButtons_SetToClosedState()
    {
        var tabGroup = new UiPanel();
        var btn      = MakeButton();
        tabGroup.AddChild(btn);

        var layout = Fake((CharacterStatController.TabTitlesId, tabGroup));

        CharacterStatController.Bind(layout, SampleData.SampleCharacter);

        Assert.Equal("Closed", btn.ActiveState);
    }

    // ── Affordability helpers (GetRaiseCost) ──────────────────────────────────

    [Fact]
    public void GetRaiseCost_Index4Focus_Returns110()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(110L, CharacterStatController.GetRaiseCost(sheet, 4));
    }

    [Fact]
    public void GetRaiseCost_Index0Strength_Returns0()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(0L, CharacterStatController.GetRaiseCost(sheet, 0));
    }

    [Fact]
    public void GetRaiseCost_OutOfRange_Returns0()
    {
        var sheet = SampleData.SampleCharacter();
        Assert.Equal(0L, CharacterStatController.GetRaiseCost(sheet, 99));
    }

    // ── GetRowName helper ─────────────────────────────────────────────────────

    [Fact]
    public void GetRowName_Index0_ReturnsStrength()
        => Assert.Equal("Strength", CharacterStatController.GetRowName(0));

    [Fact]
    public void GetRowName_Index4_ReturnsFocus()
        => Assert.Equal("Focus", CharacterStatController.GetRowName(4));

    [Fact]
    public void GetRowName_Index6_ReturnsHealth()
        => Assert.Equal("Health", CharacterStatController.GetRowName(6));

    [Fact]
    public void GetRowName_NegativeIndex_ReturnsEmpty()
        => Assert.Equal(string.Empty, CharacterStatController.GetRowName(-1));

    // ── SampleData sanity ─────────────────────────────────────────────────────

    [Fact]
    public void SampleCharacter_SkillCredits_Is96()
        => Assert.Equal(96, SampleData.SampleCharacter().SkillCredits);

    [Fact]
    public void SampleCharacter_UnassignedXp_IsSet()
        => Assert.Equal(87_757_321_741L, SampleData.SampleCharacter().UnassignedXp);

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_HasNineEntries()
    {
        var costs = SampleData.SampleCharacter().AttributeRaiseCosts;
        Assert.NotNull(costs);
        Assert.Equal(9, costs.Length);
    }

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_FocusAt110()
        => Assert.Equal(110L, SampleData.SampleCharacter().AttributeRaiseCosts[4]);

    [Fact]
    public void SampleCharacter_AttributeRaiseCosts_StrengthAt0()
        => Assert.Equal(0L, SampleData.SampleCharacter().AttributeRaiseCosts[0]);

    // ── UiText flag sanity ────────────────────────────────────────────────────

    [Fact]
    public void UiText_RightAligned_DefaultFalse()
    {
        var t = new UiText();
        Assert.False(t.RightAligned);
    }

    [Fact]
    public void UiText_RightAligned_CanBeSetTrue()
    {
        var t = new UiText { RightAligned = true };
        Assert.True(t.RightAligned);
    }

    // ── Robustness ────────────────────────────────────────────────────────────

    [Fact]
    public void Bind_MissingElements_DoesNotThrow()
        => CharacterStatController.Bind(Fake(), SampleData.SampleCharacter);

    // ── Helpers ──────────────────────────────────────────────────────────────

    /// <summary>Manufacture a minimal UiButton with a fake ElementInfo (no dat sprites).</summary>
    private static UiButton MakeButton()
    {
        var info = new ElementInfo { Id = 0, Type = 1 };
        return new UiButton(info, static _ => (0u, 0, 0));
    }

    private static ImportedLayout Fake(params (uint id, UiElement e)[] items)
    {
        var dict = new Dictionary<uint, UiElement>();
        var root = new UiPanel();
        foreach (var (id, e) in items)
        {
            root.AddChild(e);
            dict[id] = e;
        }
        return new ImportedLayout(root, dict);
    }
}